[Live-devel] dump h264 video problem

[jacopo]

Update:
I've found an h264 video stream that I'm able to dump and play correctly
rtsp://media.lscube.org/tests/tc.mov

This one suffers the problems I was talking about:
 rtsp://streaming1.osu.edu/media2/ufsap/ufsap.mov

Both have been dumped with
./openRTSP -t -d 20 -q
command line (no fps and w/h has to be specified for firts one, for
second none worked)
Both streams are taken from a wikipedia page, so I'm quite sure they are
public...
Second stream is delivered by Helix, first one by feng.

I'm not sure about one thing. H264VideoFileSink class that inserts 4
bytes long delimiter between NAL units, is used only when streaming not
when receiving a strem, right?
If so, the problem must be container related (QuickTime or mp4 does't
matter for me) not codec related, since libraries are just dumping an
encoded stream that is not touched or modified when saved to a file (or
printed to stdout) inside the choosen container...
Am I totaly missing the point?

Thanks again
    j



On 07/28/2010 05:47 PM, jacopo wrote:
> Hi all,
>     I'm trying to implement a video recording service, and i need to
> dump  h264 or MPEG4 videos (service must be eterogenous)  in response to
> some external events.
>
> I planned to do this reimplementing openRTSP exemple, in order to
> coordinate it not from command line but with external applications.
> Before starting writing code I've tried dumping some streams from
> various rtsp sources.
> I usually start openRTSP with canonical options ( -t -d ) and with mpeg4
> video all works fine (with -4 or -q option), while h264 videos are quite
> unusable.
>
> All videos are out of sync with overlapped frames, and if I try to open
> them with mplayer the following error is reported an indefinite number
> of times:
> [h264 @ 0xb523e0]concealing 330 DC, 330 AC, 330 MV errors
> Error is not related to mplayer since also vlc or xine fail to play videos.
>
> I've specified various resolutions and fps (not needed for mpeg4, they
> just works), but none worked.
> I've read on faq about NAL unit, but I've verified that a H264FileSink
> implementation was introduced in 2007.
> I need to reimplent my own one? NAL units in h264 codec are related to
> the network transport layer, so every implementation is related to a
> single specific context or the H264FileSink implementation is generally
> usable?
>
> Ah, I'm using last version from public repo 2010.07.03 built from
> sources (of course) on a 64bit Fedora13 box, if it could in some way
> matter...
>
> Sorry in advance if some of my question seems innacurate, but I'm very
> confused and found few infos online (need I learn to google better?)
>
>
> thanks in advance
>     j
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